The invention discloses a processing method for garlic oil. The processing method comprises the following steps: taking chloropropene as a raw material; and performing vulcanization, condensation and physical layering and separating to prepare garlic oil which takes diallyl trisulfide as a main component. The processing method provided by the invention does not use organic solvents such as methylbenzene and ethyl ether, is simple in processing process and is convenient to operate; and content of diallyl trisulfide in the obtained product is greater than or equal to 50%, and the obtained product is suitable for large-scale popularization application.